Tutorials:

◊ Finding Black, White, Gray Points in Photoshop
 
◊ Simple Masking in Photoshop

◊ Straighten Your Horizon in Photoshop


 Articles:
Reviews:

◊ Red River Paper



 Actions:

◊  CS3 action for spot lightening and darkening
    This action is used to paint in dark or light areas (CS3 only)
◊  Local Contrast Enhancement
     This action gives a slight boost in midtone contrast and a bit of pop to the image